VK6QK's blog

One of the interesting things you can calulate from WSPR spots recorded on the WSPRnet web sites is the number of kilometers that each milli watt of power from your transmitter covers.
Using my WSPRLite Classic Transmitter running 200 milli watts into an OCF dipole I made the following contacts.

12-Feb-2018 at 12:28 UTC to K9AN at EN50wc total kilometers 17660.

A calculation to K9AN shows that for each 1 milliwatt of signal the Transmitter covers a distance 88.30 kilometers.

9-Feb-2018 at 20.50 UTC to F5OIH at JN06ci total kilometers 14419

Over the last week I have been running a WSRPlite Classic on various frequencies into a Buckmaster OCF dipole at an power of 200 milliwatts
the most successful bands here in Western Australia are 40 meters, 30 meters and 20 meters. Spots and 30 and 20 meters have been reported in
Norway, France Germany, England, United States, South Korea and Japan, not bad for 0.2 watts....

Currently I am running WSPR on a Raspberry Pi 1B and using the Tucson Amateur Packet Radio 20M WSPR Board. Output from the Board goes to an attenuator to reduce the output to approx. 50 milli watts.
The antenna it is connected to is a Small Dipole via a MFJ-971 QRP tuner. So far only been spotted by local station within 180 miles. The Setup at this stage is in a small cardboard box, and

I've been listening to WSPR signals for several years mainly with a Yaesu TF-450D on various bands but only occasional ran the TX part of the program, however, over the last few weeks, I have up-dated the software on my Office PC and installed PowerSDR and WSRP 2 and fitted my Flex 1500 with a MFJ-971 Tuner and connected it to a 40/80 Trap dipole at about 5 meters high. This now allows me the chance to run WSRP most of the day and night and despite the simple Antenna I am surprised how well the system is working.